JPS6078665A - Preparation of ultraviolet cured laminate - Google Patents

Abstract

PURPOSE:To form a cured film excellent in light permeability and having a uniform thickness, by laminating an uncured resin between two transparent mold release films and peeling off one of two films while placing the remainder on a base material and irradiating the resin layer with ultraviolet rays before peeling off the other film. CONSTITUTION:At first, an uncured layer 2 comprising a curable resin is laminated between two transparent release films 3, 3' and one release film 3' is peeled off while the remainder is adhered to the surface of a base material 1 and, after the resin 2 is irradiated with ultraviolet rays from the film surface to cure the same, the other film 3 is peeled off. By this method, dust adhesion is prevented and a cured film having good light transmissivity is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming a cured laminated film of an ultraviolet curable resin on plastic products, metals, paper, wood products, etc.

Conventionally, when laminating an ultraviolet curable film on the surface of a stack of base materials such as Plus Deck, the method used is to apply a fluid resin to the surface of the base material and cure it by directly irradiating it with ultraviolet light.
The process takes time, and since the paint is exposed, dust and the like adhere to it, or it hardens while floating in the resin, reducing the light transmittance of the cured film. Furthermore, due to the coating method, the thickness of the film is non-uniform, and the non-uniformity is particularly noticeable when coating on a curved surface.

This invention was carried out with the aim of solving the above-mentioned drawbacks of the conventional method and forming an ultraviolet-cured film having excellent light transmittance and uniform thickness.

UV-curable resin paints are usually of the radical polymerization type and the UV-curable epoxy type, and the radical polymerization type consists of a base resin, a reactive diluent, and a photosensitizer. The base resin is
Acrylic oligomers with an acrylic group at the end, such as polyester acrylate, urethane acrylate, epoxy acrylate-1, and spiroacecool acrylate, are used, and as reactive diluents, ethyl diethylene glycol acrylate, methyl triethylene glycol acrylate, and phenoxy Ethyl acrylate and other materials with excellent dilution effects, low volatility without deteriorating the characteristics of the base resin, and no odor or toxicity are used.

The photosensitizer used is a compound that generates radicals to initiate a polymerization reaction when exposed to ultraviolet rays.

Although many types of ultraviolet curable resin coatings are commercially available, the present invention is applicable to any of these and is not limited to the above.

In this invention, when laminating an ultraviolet curable resin (hereinafter referred to as curable resin) on a base material such as plastic, extra pressure, paper, or wood board, a transparent film having mold releasability, for example, a mold release process is applied in advance. A curable resin (2) is placed between two sheets (3, 3') of polyester film, fluororesin film, or other plastic film containing a mold release agent.
into M layers (Figure 1). At this time, the thickness of the curable resin can be made constant by, for example, calendering.

Next, one of the releasable films (3') is peeled off and bonded to the surface of the base material (1). In this way, a bond layer consisting of the curable resin (2) and the other releasable film (3) is formed on the base material (1), and then the film is irradiated with ultraviolet rays to cure it. This is a method in which the mold resin (2) is cured and the mold release film (3) on the other side is peeled off (Fig. 2).

In this case, it is preferable that the releasable film (3, 3') has a greater releasability than the one that is peeled off before bonding to the substrate (3') than the one that is peeled off after curing.

In addition, when forming a cured film on a substrate having a curved surface, a thermoplastic plastic sheet or plate, such as AB
A curable resin (2) and a releasable transparent film (3) are layered on the base material (1) by the method described above using S, styrene, MMA, polycanate, etc., and then formed by direct air molding, pressure molding, etc. A method can be used in which the desired curved shape is formed, the curable resin (2) is then cured by ultraviolet irradiation, and the releasable film is peeled off.

The cured film products obtained by this method are free of foreign substances and therefore have extremely high light transmittance, and can be used in many applications such as curved mirrors and various mirrors, furniture, building materials, show windows, etc.

In addition, UV-curing type 41-grit is generally water resistant, weather resistant,
Due to its excellent scratch resistance, it has many uses even when used outdoors.

In addition, the method for making the laminate of curable resin and releasable film is as follows:
Methods such as a roll coater, knife coater, and gravure coater can be used.

Examples of the present invention will be described below.

Example 1 Radical polymerizable hardening resin Jll (20μ) was laminated between two transparent polyester release films (thickness o, 21 m) with different release properties. After peeling off the release film of the person and laminating it on a nickel-plated copper plate, a hard film is formed by irradiation with ultraviolet rays, and the other 1ti
A metal plate laminated with a cured film having a uniform thickness and a light transmittance of 70% or more was obtained by reproducing the ll-type film.

Example 2゜Example 1. Similarly, a laminate of two transparent polyester template films (thickness 0.2 ym) with different release properties and an epoxy polymerized resin (15 μm) is used to print on high-quality paper. The resin and the template film were laminated and cured by ultraviolet irradiation, and then the template film was peeled off to obtain printed wood-free paper with a VT layer of a cured film with uniform C1 and a light transmittance of 70% or more.

Example 3゜Example 1. The method is to use ABs board (thickness I+n
A radical polymerization type resin coating $4 (15μ) and a transparent fluorine resin type release film are laminated and pasted onto m), and UV irradiation is performed to completely release the release film to create a uniform, weather-resistant product. An ABS temporary laminated layer of cured films with excellent hardness and scratch resistance was obtained.

Example 4゜Example 3. In the same manner as above, a radical polymerizable resin (thickness 20 μm) and a transparent fluororesin release film were laminated and pasted on the MMA board (in order of thickness 0.5), and then the board was assembled using a vacuum forming method. The outer crab was molded into a hemispherical shape, irradiated with ultraviolet rays, and the resin was made into a cured film.The releasable film was then peeled off and the inner wall of the hemispherical shape had a light transmittance of 70% or more and excellent weather resistance and scratch resistance. A molded product with laminated cured films was obtained.

As described above, the method according to the present invention involves laminating an uncured resin between two transparent release films when forming a cured IIQ on a base material by ultraviolet curing, and forming a release film on a substrate. This is a method in which the material is peeled off, laminated on the M side, and cured with ultraviolet rays either as is or after being molded, and another release film is attached, which prevents the adhesion of dust. Or to prevent curing due to floating dust,
It is possible to obtain a cured film with extremely good light transmittance.

Further, although vacuum forming, pressure forming, etc. can be performed before curing, a cured film can be uniformly formed even on a curved surface or a surface with many irregularities.

[Brief explanation of drawings]

FIG. 1 is an enlarged cross-sectional view of a state in which a laminate is laminated and adhered to a base material. FIG. 2 is an enlarged sectional view showing the state in which the glII type film is peeled off after curing. FIG. 3 is an enlarged cross-sectional view of a state in which a curved body is molded, cured with ultraviolet light, and the release film is peeled off. In the figure 1----------1 base material 2--
−−−−−−−−−−−−−Ultraviolet curable resin layer 3.
3'-----Releasable film patent application 1 Osaka Co., Ltd. agent Patent attorney Ogawa -omi [,・

Claims (3)

[Claims] (1) Two releasable transparent films are laminated with an ultraviolet curable resin interposed between them, one is peeled off and one is attached to the surface of a base material, and then cured on the base material by UV irradiation. Curing B, which is characterized by forming a film and peeling off the other transparent film having releasability! Method for manufacturing 2M layered body. (2) Of the two transparent films with mold releasability, the degree of mold release of the film corresponding to the side to be laminated to the surface of the base material is greater than the degree of mold release of the film on the other side (outer surface). A method for producing a cured film 8 layered body according to claim 1. (3) After molding the @1N body by vacuum forming, pressure forming, etc. while it is adhered to the surface of the base material, UV curing is performed, and then the release film on the outer surface is peeled off. 2. A method for producing a cured film laminate according to item 2.